After the publication of this work [1] it was noticed that there were typographical errors in the following equations: equation 5 in column 2, equation 7 in column 2, equation 8 in column 1. The bracket was placed incorrectly, so it should read: log_2 (Y_{gij} + 0.5) rather thank (log_2 Y_{gij} + 0.5) The publisher apologizes for this error.
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